Question

The pressure exerted by a phonograph needle on a record is surprisingly large. if the equivalent of 1.00 g is supported by a needle, the tip of which is a circle 0.220 mm in radius, what pressure is exerted on the record in n/m2? (you do not need to enter any units.)

Answer 1

The answer is 585 mm Hg.  By using the formula P=F/A, we derive the answer  585 mm Hg.  The pressure exerted by a phonograph needle on a record is surprisingly large. if the equivalent of 1.00 g is supported by a needle, the tip of which is a circle 0.220 mm in radius, The pressure exerted on the record in n/m2 is 585 mm Hg.